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Test the alternator. The battery light is for the charging system. Once the charging system is working with the engine running, the light should go off. If your light stays on with engine running, the alternator may need service or replacement.

To test the charging system, just put a voltmeter on the battery with engine running. The voltmeter should register at least 13.5 volts- alternator is charging. If you only show battery voltage with engine running, like 12.2-12.8 volts, the alternator or charging system is not working. The battery light should be on to signify this.

it seems that the battery is not charged or not connected. When you open any door the light inside must turn on. When not, the battery is not charged. Charge the battery and try again.When the battery goes again out of the power, it indicate that the charging system or alternator are not working properly. Start your vehicle turn the headlamps on and check the voltage on battery. It must be higher than the voltage when engine is off.If the voltage with engine on is about 14,5 V charging and alternator are ok. Maybe the battery is dead.When the voltage with engine on is higher than with engine off but not 14,5 V, there is problem with charging system. When the volage is the same, it can be alternator or charging system.

You can test the charging system by starting the mower and then unhooking the negative terminal from the batter, if the mower stays running, the charging system is working, if it dies immediately the charging system is faulty, you can also use a tester at the engine to test the voltage at the connectors

If the lights drain the battery when the engine is running, then you have a bigger problem of the alternator not charging, not working. When the engine is running, the alternator supplies all the current to run the car's electrical systems, while also charging up the battery for the next start-up. If you know the alternator is good, then maybe a fuse or fusible link has blown, preventing the alternator from working. To check, put a voltmeter on the battery with engine running-it should show over 13.5 volts if the charging system is working. If the alternator is not putting out, the voltmeter will read same voltage on the battery as when the engine is not running. A fully charged battery should show "around" 12.6 volts. A discharged battery will show less than 12 volts. That should give you an idea of the range to look for on a voltmeter. I believe some parts stores will check the voltage for free. I know most stores will test the alternator and battery for free if brought into the store, but you need the voltage read while on the car and engine running. If the system is charging normally and the lights kill everything, you may have a short in the lighting system.

It is possible that there may be a battery/charging system problem (in which case, the next step will be that the engine will not run). Then again, you may have separate problems. The radio not working and the Check Engine light turning on might not be related at all. However, a failed Vehicle Speed Sensor (VSS) or open/shorted VSS circuit would make the speedometer quit working AND cause the Check Engine light to come on.

Proper diagnosis is the only way to find out for sure.

I would BEGIN by performing a thorough battery/charging system test. Then you need to scan your onboard computer to find out WHY it has turned the Check Engine light on. This should be done BEFORE the battery cables are disconnected for any kind of charging system or battery repair. Once the cables are disconnected, the computer memory will be lost and you will not get any codes to tell you why the computer has turned the light on. You MAY have a charging system-related code like "Voltage Low At Module" or you MAY have a totally different code like "VSS Circuit Open or Shorted". You need to find this out before making ANY repairs.However, if the charging system tests faulty and/or you have any charging system fault codes, ALL fault codes should be recorded and the battery/charging system problem needs to be dealt with FIRST. (you cannot trust what the computer is telling you if there are charging system faults.) If after this, any symptoms persist, diagnosis of any other fault codes retrieved should be performed.

If all engine control problems are resolved and your radio still does not work, you need to diagnose your radio circuits as a separate problem.

then you have a problem in the dashboard could be the circuit board behind the dash if you would like to i will tell you how to eliminate the dash from the charging system or install a straight wire from the ignition power to the ignition side of the alternator bulb,
but if you still want me to tell you how to elimiated the dash from chargin system let me know
of course this will be a mikey mouse but will take care of your problem.